Tp-link BE900 redundancy issue

I used to an ASHS router and have configured successfully to switch the connection to Wan2 if Wan1 goes down. I am attempting to apply the same configuration to the BE900. I have selected the Auto Internet port option and connected the cable to the 10Gbps port 2. However, it is not functioning as expected. When the connection from port 1 fails, port 2 does not take over. Do you have any idea on what might be wrong?

I used to an ASHS router and have configured successfully to switch the connection to Wan2 if Wan1 goes down. I am attempting to apply the same configuration to the BE900. I have selected the Auto Internet port option and connected the cable to the 10Gbps port 2. However, it is not functioning as expected. When the connection from port 1 fails, port 2 does not take over. Do you have any idea on what might be wrong?